Answer: King Prithvi Narayan Shah of Nepal initiated the unification of Nepal in 1743.
Step-by-step explanation:
He initiated the aggressive campaign to broaden his Kingdom's extension. He adopted the name of Name of Nepal for the Gorkha Empire. The four major wars for the unification of the territory of the Nepal by King Prithvi Narayan Shah.
Gorkha empire defeated the British East India Company in 1824.
He conquered Bhaktapur in 1826.
He conquered and defeated the nawab of Bengal that was Mir Kasim, in 1819.
He successfully conquest the Kathmandu Valley.